diff options
author | obrien <obrien@FreeBSD.org> | 2002-06-30 08:57:17 +0000 |
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committer | obrien <obrien@FreeBSD.org> | 2002-06-30 08:57:17 +0000 |
commit | 88865578169ad3301414679094f607e5ddc137b5 (patch) | |
tree | 9057c46d595433c8672ada5b95569afb267c87b8 /sys/amd64/include/endian.h | |
parent | 6f349b9e5084b093f3716d5d7b2b24e58ab64c30 (diff) | |
download | FreeBSD-src-88865578169ad3301414679094f607e5ddc137b5.zip FreeBSD-src-88865578169ad3301414679094f607e5ddc137b5.tar.gz |
This is the start of the FreeBSD/x86_64 kernel.
Diffstat (limited to 'sys/amd64/include/endian.h')
-rw-r--r-- | sys/amd64/include/endian.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/sys/amd64/include/endian.h b/sys/amd64/include/endian.h new file mode 100644 index 0000000..a5ce643 --- /dev/null +++ b/sys/amd64/include/endian.h @@ -0,0 +1,119 @@ +/*- + * Copyright (c) 1987, 1991 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)endian.h 7.8 (Berkeley) 4/3/91 + * $FreeBSD$ + */ + +#ifndef _MACHINE_ENDIAN_H_ +#define _MACHINE_ENDIAN_H_ + +#include <sys/cdefs.h> +#include <machine/ansi.h> + +/* + * Define the order of 32-bit words in 64-bit words. + */ +#define _QUAD_HIGHWORD 1 +#define _QUAD_LOWWORD 0 + +/* + * Definitions for byte order, according to byte significance from low + * address to high. + */ +#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ +#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ +#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ + +#define _BYTE_ORDER _LITTLE_ENDIAN + +/* + * Deprecated variants that don't have enough underscores to be useful in more + * strict namespaces. + */ +#if __BSD_VISIBLE +#define LITTLE_ENDIAN _LITTLE_ENDIAN +#define BIG_ENDIAN _BIG_ENDIAN +#define PDP_ENDIAN _PDP_ENDIAN +#define BYTE_ORDER _BYTE_ORDER +#endif + +#ifdef __GNUC__ + +#define __word_swap_int(x) \ +__extension__ ({ register __uint32_t __X = (x); \ + __asm ("rorl $16, %0" : "+r" (__X)); \ + __X; }) + +#if defined(_KERNEL) +#define __byte_swap_int(x) \ +__extension__ ({ register __uint32_t __X = (x); \ + __asm ("bswap %0" : "+r" (__X)); \ + __X; }) +#endif + +#define __byte_swap_word(x) \ +__extension__ ({ register __uint16_t __X = (x); \ + __asm ("xchgb %h0, %b0" : "+q" (__X)); \ + __X; }) + +static __inline __uint64_t +__bswap64(__uint64_t _x) +{ + return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | + ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | + ((_x << 24) & ((__uint64_t)0xff << 40)) | + ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); +} + +static __inline __uint32_t +__bswap32(__uint32_t _x) +{ + + return (__byte_swap_int(_x)); +} + +static __inline __uint16_t +__bswap16(__uint16_t _x) +{ + + return (__byte_swap_word(_x)); +} + +#endif /* __GNUC__ */ + +#define __htonl(x) __bswap32(x) +#define __htons(x) __bswap16(x) +#define __ntohl(x) __bswap32(x) +#define __ntohs(x) __bswap16(x) + +#endif /* !_MACHINE_ENDIAN_H_ */ |